Eureka

The exclamation attributed to Archimedes, who is said to have cried out "Eureka! eureka!" (I have found it! I have found it!), upon suddenly discovering a method of finding out how much the gold of King Hiero's crown had been alloyed. Hence, an expression of triumph concerning a discovery.

an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire